Boiler-grate.



D. K. BRIGGS & '1. N. SMITH.

BOILER GRATE. APPLICATION FILED MAY 23, 1913.

1,121,791. Patented Dec. 22, 1914.

Witnesses igaventors Attorne ysinnrsn smrns PATENT osFIou.

DAVID K. BRIGGS AND THOMAS N. SMITH, OF PORTSMOUTH, VIRGINIA, ASSIGNOBS OF ONE-THIRD TO SAMUEL B. ANDREVS, 0F

BOILER-GRATIS.

Specification of Letters Patent. Patented De 22 1914 Application filed May 1913 serial no! s.

, T 0 all whom it may concern:

Be it known that we, 'DAvn) K. BRIGGS and THOMAS N. SMITH, citizens of the United States,'residing at Portsmouth, in the county of Norfolk, State of Virginia, have invented Anbtherobject of the invention is to provide a grate bar combining a maximum amount of air space with a maximumstrengthto resist transverse rupture.

Another ob ect of the invention 15; to provide a grate bar which is adequately rein forced against torsional strain.

It is withinthe-scope of the invention to improve generally and to enhance the utility, of devices-o1 that type to which the present invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of'invention herein disclosed can be made within the scope of what is claimed without departing fromthe spirit of the invention.

In the drawing :-Figure 1 shows one form of the invention in top plan; Fig. 2 is a side elevation of the structure shown in Fig. 1; Fig. 3 is an end elevation of the ends with trunnions 2 whereby the bar may be supported for rocking movement. The bar 1 comprises longitudinal ribs 3, thickened end portions 4 uniting the T1135 3, and

connections 5 uniting the ribs'3. The con-.

nections 5 and the ribs 3 define aplurality of transverse openings 6, disposed in a line extending from one end of the ate to the other. One of the connections, enoted speclfically by the numeral 7 is broader than the other connections and the corresponding opening 8 is decreased in length to provide for the formation of a shaker-lug'9 shown in Figs. 2 and 3. Tongues 10 project from the.

outer edges of the ribs 3, the tongues 10 alternating with the connections 5. Especial att nti n is directed to: the alternating rela- I tion existing between the tongues 10 and the connections 5, since, by this construction, a

maximum amount of metal remains at the ends of the openings 6.

The grate herein disclosed is fashioned from cast iron. Embedded in the ribs 3 are reinforcing elements 11. The reinforcing elements 11 preferably are bars of wrought iron or steel. The bars 11 are inclosed' circumferentially and throughout their entire lengths within the ribs 3.

Owing to the fact that the reinforcing elements 11 are provided, the grate bar will not drop should the cast body portion thereof be broken transversely. It is to be observed ,80 that the reinforcing bars 11 do notintersect the openings 6 but liecom letely within the contour oi the ribs 3. s a consequence, continuous longitudinal portions of the grate bar are reinforced by the members 11.

In this connection, it is to be noted, again, that the tongues 10 are disposed in alternating relation with respect to'the connections 5, the entire construction under-discussion serving to increase the strength of the bar so greatly.

In Fig. 5, the bar 12 comprises ribs 14, connections 15 between the ribs, and tongues 16 alternating with the con nections 15, as -hereinbefore described. In

this form of the invention, however short lugs 17 project inwardly, toward each other, from the ribs 14, the openings *18 being therefore of H shape. The trunnions are denoted by the numeral. 19 and the reinforcing elements 20 are placed as hereinbefore described.

Referring to Fig. 6, and noting the point at which the reference character 21 is applied,"it will be observed that the reinforcmg elements 20 are shouldered, the shoulders, ordinarily, althou h not necessarily,

being formed by ofisettmgthe reinforcing PORTSMOUTH, g

preferably 70 elements slightly. Owing to the fact that Having thus described the invention, what the reinforcing-elements 20 are shouldered as indicated at '21, any tendency towards relative longitudinalmovement between the reinforcing elements 20 and the body .portions of the bar will be prevented, and as a. consequence, the bar will remain in a straight line, and Willnot sag, even when the cast body of the bar has beenruptured. The feature indicated at 21 is applicable tothat form of the invention which is shown in Fig. 1, and may constitute a part thereof.

' nients -11, torsional strains are provided for adequately. A maximum air space is com bined with a maximum strength to resist transverse rupture; combustion of fuel is enhanced, the bar is made of peculiar efliciency in pulverizing and grinding cinders, anda dropping of the severed ends of a broken I bar is prevented.

Referring to F igs. 7 and 8, the grate bar is denoted generally by the numeral 25 and comprises one or more longitudinal ribs 26. The reinforcing element is denoted by the numeral 27 and the lower edge of the rib 26 is grooved as indicated at 28 to receive the reinforcing element. In Figs. '7 and 8, the reinforcing element is, therefore, but partially embedded in the grate bar. At its ends, the reinforcing element 2'1 is equipped with an upstanding finger 29 which enters the body portion of the rate bar. The finger 29 exercises the same unction as the off set 21 shown in Fig. 6, and

prevents relative longitudinal movement be- ,tw een the reinforcing element and the grate bar proper.

is claimed is s '1; In a device of the class described, a

grate bar comprising a. body provided atits ends with journaling'means; and reinforcing elements engaged throughout their lengths with the body, portions of the body being interposed between. the reinforci elements and the fire supporting surface the bar, the reinforcing elements being 10-:

'cated upon opposite sides of the line of centers of the'journaling means and-b'eingof greater tensile strength than the body, thereby to resist a torsionalstrain in'the body when the latter is rockedv on the journaling means. I 2. In a device of the-class described, a

grate bar comprising a bo'dy provided at its ends with journaling means; and reinforcing elements engaged throughout their lengths with the body, the reinforcing elements being located upon opposite sides'of the line of centers of the journaling means and being of greater tensile strength and of greater fire resisting qualities than, the body thereby toprevent a simultaneous burning out of the body and the reinforcing" elements, and to maintain the bar operative to resisttorsion when the bar. is rocked on the journaling means.

In testimony that we claim the foregoingas our own, we have hereto aflixed our signatures-in the presence of two witnesses.

Witnesses Gno. E.v BROWN,

Tnos. H. WEBB. 

